Steam-engine.



` Patentedmayla, |002.

A. J. MARKHAM.A

STEAM ENGINE.

(Application led Feb. 8, 1 902.)

(N0 Model.)

UNITED STATES PATENT OFFICE.

ANDREW J. MARKHAM, OE ELBA, NEBRASKA, ASSIGNOR OF ONE-HALF n'IO JOHNMORROV, OF ELBA, NEBRASKA.

STEAM-ENGINE;

SPECIFICATION forming part of Letterslatent o. 700,064, dated May 13,1902.

Application led February 8, 1902. Serial No. 93,191. (No model.)

T LZZ whom t may concern;

Be itknown that I, ANDREW J. MARKHAM, a citizen of the United States,residing at Elba, in the county of Howard and State ofNebraska,haveinvented anew and useful Steam- Engine, of Which'thefollowingis a specification.

My invention relates to certain improvements in steam-engines, and hasfor its principal object to provide the cylinder with valves andvalve-operating mechanism so arranged as to effect the simultaneousopening and closing of the steam inlet and exhaust valves at oppositesides of the cylinder' at the end of the stroke of the pistoni A furtherobject of the invention is to provide for the adjustment of the parts toenable the valves to be opened or closed at any desired point near theend of the stroke, as fully set forth hereinafter.

With these and other objects in view the invention consists in the novelconstruction and combination of parts hereinafter described,illustratedin the accompanying drawings, and particularly pointed out in theappended claims.

In the drawings, Figure 1 is a sectional plan View lillustrating thecylinder, valve, and valve-operating mechanism of an engine made inaccordance with my invention. Fig. 2 is a side elevation of the same.

In the cylinder 5 is a piston, which may be of any ordinaryconstruction, said piston being connected by a piston-rod 7 to aconnecting-rod 8, either to a crank-shaft orother point where thepressure of thefsteam 4is to be utilized or converted into motion. kOnopposite sides ofthe cylinder aresteam-chests 9 lO, respectively, thecylinder being connected to said steam-chests by inlet-ports 11 andexhaust-ports 12. Tothe steam-chest 9 is connected a supply-pipe 14, andto the steamchest is connected an exhaust-pipe 15, or the latter maybein the form of a simple opening to exhaust the steam or otheruiddirectly to the` outer air.

In the steam-chest Q'isaslide-valve 16, hav.

Vthe cylinder.

either of the cylinder-ports 12 to permit the escapeof steam from eitherend of thelcylinder. The valve is connected toa Valvestem 22, extendingout through a stuffingvlooX 23.

Theengine is provided with cross head guides 24; of any ordinary typeand adapted for the reception of a suitable cross-head 25, to which areconnected the piston-rod 7 and the connecting-rod 8. At a pointxnear theforward end of the cross-head guides is bolted a transverse bar 26, towhich is centrally pivoted a locking-bar 27, having at its opposite endspins or bolts 28, to which are connected the ends of the valve-rods 18and 23. The Valve-rods'lS and 23 are preferably sectional, the adjacentends of the sections being threaded for the reception of a nut 29,having right and left hand screw-threads f or engagement with thesimilar threads of the sectionsA of the valve-stem, so that .theposition of the valve may be properly adjusted at any time'by increasingor decreasing the'distance between the center of its port and the pin orbolt 28.

To the cross-head'is secured a tappet-bar 30, which projects beyond theline of the crosshead and is disposed immediately above the valve-rod18, said valve-rod for the greater portion of its length beingsubstantially rectangular in form and provided with projecting lugs 3lfor engagement bythe cross-head bar as the'latter is traveled to and froby the movement of thepiston. The distance between. the lugs 3l withrespect to the stroke of the piston is suchthat as the latter nears thelimit of its stroke in either direction the tappet-bar will engage withone or other of the lugs, ,moving the Valve-rod 18 and the steam-valveto the opposite position for the admissionbf steam to the opposite endsof This movement is transmitted by the connecting-bar 27 totheValverod22of the eXhaust-valvein reversefdirection, the operation beingsuch that'.as the steam-port leading from one end of the cylinder v'is open theabove port leading to the opposite end of roc the cylinder will also beopen, permitting the free escape of the steam from the exhaust side ofthe piston.

In order to provide for the adjustment of the valve movement withrespect to the stroke of the piston, I preferably provide the lugs 3lwith threaded openings for the reception ofvadjustable bolts 32, whichmay be moved either toward or from each other, as circumstances mayrequire, to permit the movement of the valve at a desired point in thestroke of the piston. These bolts will also serve to prevent any Wear onthel lugs and may be adjusted from time to time in order to compensatefor wear either on the tappet-bar or on the ends of the bars with whichsaid tappetbar makes contact.

While the construction herein described, and illustrated in theaccompanying drawings, is the preferred form of the device, it isobvious that various changes in the size, proportion, and minor detailsof the structure may be made without departing from the spirit orsacrificing any of the advantages of my invention.

Having thus described my invention, what I claim isl. The combination ina steam-engine, of the cylinder, valve-chests arranged on opposite sidesof the same, there being ports or passages leading from the oppositeends of the cylinder to said valve-chests, slide-valves disposed withinthe chest, valve-rods connected to said valve and to each other, one ofsaid valve-rods having a pair of lugs, and a tappet-bar actuated by themovement of the piston of the engine and adapted to make contact withsaid lugs.

2. The combination in an engine, of the cylinder, valve-chests arrangedon opposite sides of the same, there being ports or passages leadingbetween the valve-chests and the opposite ends of the cylinder, a pistonin said cylinder, a piston-rod connected to the piston, a tappet-barconnected to and movable with the piston-rod, valve-rods connected tothe valves, a pivoted lever to which both rods are connected, and one ofsaid valverods being provided with lugs adapted to be engaged by thetappeti-bar, substantially as specified.

3. The combination in a steam-engine, of the cylinder, valve-chestsarranged on opposite sides of the same, there being ports or passagesleading between the Valve-chests and the opposite ends of the cylinder,a piston in said cylinder, a piston-rod 7 connected to the piston, across-head 25 connected to the piston-rod, cross-head guides 24 carryingsaid cross-heads, a tappet-bar 30 secured to the cross-head andprojecting laterally therefrom, a transverse bar 26 connecting thecross-head guides,a bar 27 pivotally connected to said bar 26, anadjustable valve-rod 22 connecting the exhaust-valve to one end of thebar 27, an adjustable Valve-rod 18 connecting the steam-inlet valve tosaid bar 27, lugs 3l carried by said Valve-rod 18, and screw-bolts 32carried by said lugs and adapted for contact with said tappet-bar 30,substantially as and for the purpose specified.

In testimony that I claim the foregoing as my own I have hereto axed mysignature in the presence of two witnesses.

ANDREW- J. MARKHAM.

Witnesses:

PETER JEPsoN, JOHN MoRRoW.

